Hey Rick, I am gonna assume you mean that the front surfaces where the elevator and stab are to be joined are the problem. If this is so I would suggest you make a new elevator. It is probably a piece of solid wood around the 1/4" size. Just go to your local hobby shop and buy a piece of appropriate wood and using your hobby knife and a straight edge. Cut a new one and rebevel the front. To fix the problem would be more hassle than it is worth. If you sand it flat it will no longer be the same size end to end. Or if you sand it straight you will not have enough elevator area. Just make a new one. There is no hurry. When you are done and flying it you will be glad you did. Good luck on your project.

Mark Shuman